Mechanism for operating furnace-doors.



S. D. ROSENFELT & H. HELMHO-LTZ.

MEGHANISM FOR OPERATING PURNAGE DOORS.

APPLICATION FILED JUNE 12. 1909.

Patented Aug. 9, 1910.

Unire srrwns rageng y anion...

SAMUEL ROSENFELT lAND HENRY HELMHQLTZ, OYYFCHICAGO, ILLIVNOIS.

MECHANISM FOR OPERATING lFURNACIEHDOORS.

.pplication filedJune 12, 1909. Serial No. 501,785.

To all whom 'it may concern:

Be it known that we, SAMUEL D. Roslin- FEL'r and HENRY I'lnLMnoL'rz, citizens of the United States, residing at Chicago, county 'of'Colg and State of Illinois, have invented certain new and useful Improvements in Mechanism for Operating Furnace-Doors, of which the' following is a specification.

@ur invention relates to mechanism for mechanically opening and closing the firedoors of a furnace, and more specifically to such asis designed particularly for use in conjunction with the tire-doors of a locomotive.

The object of our invention-is to provide a mechanism of the character mentioned `vhich will be quick acting in operation and of the highest possible etliciency.

A further object of 'our invention is to provide a mechanism as mentioned which Will be strong, and durable and which will be extremely simple of construction, hence of low cost to manufacture.

Other objects will appear hereinafter.

lilith these objects in View our invention consists in a. fluid pressure actuated mechanism characterized as above mentioned and in certain details oi' construction and arrangement of parts all as will be hereinafter fully described and particularly pointed out in the claims.

Our invention will be more readily understood by reference t0 the accompanying drawings forming a part of this specification, and in which,

Figure l is front elevation of a locomo` tive boiler and a"section of the floorof the locomotive cab showing the same equipped with the preferred form of our mechanism, Fig. 2 is aneenlarged central longitudinal sectionof a cylinder embodied in our mechanism, Fig. 3 is a detail of a toothed rack included in the construction, Fig. Ll, an enlarged central longitudinal section of a tluid flow controlling valve embodied inthe construction7 and Fig. 5, a similar' section of said valve showing the parts in a different position.

Rei'erring now to thc drawings, l indicates the boiler of a locomotive engine and 2 the mouth of the tire box thereofI surrounding which is the usual reinforcing annular edging Closing said mouth are preferably semi-circular similar doors 4-fl, the same being pivotally secured to said edging side of the edging 'ing by a pipe 18 by pivotal pins 5 passing through the enlarged upper end portions G-Grespectively thereof. 'Said portions 6-G are circularly formed and are formed in their perpheries with meshing spur teeth 7, the latter obviously serving to effect the simultaneous movcnient of said doors, in other words, theopening or closing of either. of said doors: will simultaneously cause the opening or closing of the other. y l y lteferring now particularly to `the preferred form `of our mechanism shown in Fig. 1,' mounted preferably upon an ix'itegra'l enlargement S projecting frointheedging is a horizontally disposed' cylinder 9 in which is mounted a piston head lO'carrying an exteriorly projectingpiston `rod l1 the latter being mounted in bearings provided in the cylinder h'ead'lQ and a bearing bracket 13 secured. to and projectingfrom the locomotive boiler head. la indicates a connecting link the respective extremities of which are pvot-ally secured to the piston rod lil and the outward side of the door eniargement G. Such provision it is evident, effects the operative connection of the piston rod and the doors elet', it being obvious that upon the reciprocation to the right of the piston 10 and hence said rod, said doors will be opened. Mounted preferably upon an' enlargement l5 projecting from the lower is a valve 16. -Comprised in said valve is an'outer tubular casing 17 provided in itsfup'p'er enlarged end portion With an intake port 18 communicat with any suitable source of compressed tiuid supply, prefeably the main drum of the locomotive, in its lower end portion with an exhaust port 19, and intermediate said ports 18 and l) with an opening 2O which communicates by a pipe 21. With the cylinder' 9. lSlidably mounted in said casing is the cylindrical valve plug 22. Formed in said plugl is a central longitlulinal extending -passage 23 the offset. upper end portion 24v of vwhich opensc-.lose to the upper extremity of said plug, the oli'set lower end portion 25 thereof communicating with a circumferential lgroove 2t? formed in the outer surface of said'l'ilug'at the lower end por` tion thereof. Formed iu the plug 2Q interme'diate the passages 2l and .25 are similar passages QT and 2S communicating at theirV inner extremities with the passage Q3 andA their outer extremities with circumferential` Specification of Letters Patent. Eatented Aug. 9, 1.910. i

its lowermost position, such communicationv between said supply pipe and cylinder will be cut ott' and communication will be established between the latter and the exhaust port lt), as clearly shown in Fig. 4. 1n order to normally holo. said plug at its lower-most position, or in a position 1n which the pro- `)ecting flange 29 formed at the upper extremity thereof is resting in engagement with the shoulder 30 formed in the upper enlarged portion of the casing 17, we provide a helical compression spring 3l vinterposed between the upper extremity of said plug and the head32 closing the upper extremity of said casing. A gage cock of suitable design is provided in the exhaust port 19 by means of which the tlow of the exhausting Huid therethrough may be regulated for reasons which will be hereinafter described. 34 indicates a foot lever rockingly mounted upon a standard= secured to and suitably positioned uponl the locomotive cab licor. '.lhe inner extremity of said lever rests in engagement with the lower extremity of the valve plug 22, hence by depressing the outer extremity thereof the valve lomay evidently be actuated.

In'the construction thus far described i upon desiring to open the door of the lire box, all that is necessary is to depress the foot lever Upon so doing the valve plug 22 will be elevated whereupon communication will be established between the supply pipe 18 and the cylinder 9 as before described. ln such event the piston head l() and hence the rod 11 carried thereby will be forced to the right thereby evidently causing the opening of the doors 4-4 as shown in dotted lines in Fig. l. When it is desired to close the lire-doors said leverneeds only vto be released, in such event the valve plug, because of the spring 3l, will be returned to its normal position or in a position in which an exhaust passage through the valve 1G from the cylinder lis effected, as before described, hence permitting of the exhaustion of the compressed lluid from the cylinder and the closure of the fire-doors which drop to such position by gravity. It is in order to prevent said doors dropping' with a slam or with too great a velocity that the gage cock 33 is provided. WY ith such provision, the low of exhaustin fluid, as before stated, may be throttled sul iciently to prevent the piston head l() being forced back too quickly to normal position and hence the tire-doors to drop to closed position with too great a velocity. In order to prevent the piston an extent slightly greater than the thickness f of the piston head. With such provision it is', y

evident that, upon the piston inits forward movement reaching a vposition intermediate said openings, or a position as shown in dotted lines in Fig. 2, a quantity of air will flow through said passage to the opposite side of the piston, such action evidently equalizing the pressure on each side of the moving piston, thus stopping the motion thereof and preventing the jamming of the saine against the cylinder head .A valve needle 88 is preferably provided by means of which the flow of fluid through, said passage may be regulated.

Having its lower extremity pivoted as at 39 to the locomotive boiler head, is a lever 40 carried at the lower extremity of which is a tubular member 41 in pivotal connection therewith. Having its end portion 42 slid ably resting in said member 41, the opposite extremity thereof being pivotally connected as at 43 to a lug 44 depending from the piston rod 1l is a rod 45. lVith such construction, the opening of the lire doors may evident-ly be effected by a slight rocking of said lever, hence uponthe compressed fluid actuated means described becoming inoperative through disarrangement or any other r use,

the fire-doors may still be opened by ma. ual

doors may be locked or held in any position desired. By having a slidable connection between the tubular member 4l and the rodI 45, when the piston and its rod are actuated by fluid pressure, the lever 4l will evidently not be vibratcd, inasmuch as the rod 45-will merely reciprocate in said member 4l. 47 indicates a guide strap or loop for said lever.

While we have shown what we deem to be the preferable forms ofvour mechanism we do .not wish to be limited thereto as there might be many changes made in the details of construction and the arrangement of parts without departing from the spirit of our invention eomprehended within the scope of thcappcnded claims. And although we have designcdour mechanism with special reference to locomotive engine boilers wemay use the same yin connection with any other construction tol which'it is applicable.

Having described our invention what we claim as new and desire to secure by'Letters Patent is: f

1. The combination with a furnace, ofir'e doors pivoted at their upper extremities to swing 1n the same vertical plane; intermeshing gear teeth on the upper extremities of said doors; a piston cylinder, means for admission and exhaust-for said cylinder; a piston rod; a link connection between' said piston rod and said doors for operating the latter; a manually operated lever pivoted to said furnace;'means for holding said lever in different positions; a tubular socket member pivoted `to said lever; and a connecting' rod'slidable in said socket member and connected with said piston rod, substantially as described.

2. The combination with a furnace, of-ire doors pivoted at their upper extremities to swing in the same vertical plane; in termeshing gear teeth on the upper extremities of said doors; a plston cylin er; means for admission and l exhaust for said cylinder; means for regulating the exhaust; a piston rid; a link connection between said iston rod and said doors for operating the atter; a manually operated lever pivoted to said furnace; means for holding saidlever in different positions; a-tubular socket member pivoted to said lever; and a connecting rod slidable in said socket member and connected with said piston rod, substantially as described.

In testimony whereof .we have signed our of two subscribing witnesses.

SAMUEL D. ROSENFELT.. HENRY HELMHOLTZ. Witnesses:

HELEN F. Lmms, JOSHUA R. H. Po'l'ls.l

names to thisspecication in the presence 

